84 Johnson fuel line length

Arronh

Petty Officer 3rd Class
Joined
May 31, 2019
Messages
88
Hello. If this has already been covered, please direct me to the correct thread.
I have a 84 Johnson 9.9hp. In my 12 foot boat, I like to have the gas tank close to the front for weight distribution. The gas line is about 10 feet. Does the length of the gas line cause the fuel pump to work harder, reducing the amount of fuel flow and, therefore, engine output? Should I shorten the gas line for better performance?

Also, when I checked the gear oil for water when winterizing this year, I noticed it seemed a bit milky compared to my merc 115. Are there any instructions, links, or videos available on how to trouble shoot the water issue?

Lastly, when I was fogging it, I had it hooked up to some muffs. I didn’t expect water to be coming out of the spot I’m looking at on this video.
any issues here?
I just bought this motor this spring. It performed very well, and I’d like to keep it that way.
Thanks!
 
Last edited:

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,468
Keep fuel to the shortest length.----Using 3/8" ID hose where possible helps the pump too.
 

kbait

Commander
Joined
Nov 13, 2007
Messages
2,471
My tank has been in front (14’).. many years and several different motors.. currently 15 Johnson ‘85. No issues at all. 5/16” fuel hose. That said, shorter,thicker hose would offer less resistance for fuel flow, but probably not significant with such a short vertical lift.
 
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